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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef0257f699f0142984a33a86a3dc6f64e80f54ad1ccbe279d61accdaee08a3d2' 
  AND token = '/YYgvtNLkde0ZuLYPm0Tv7R41Fr/EZzhDgl/3oDhmss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00168

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}