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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f36edc5d168ecbd50c6c4a3c0b7634b760301c5190c900564d7f88a1e78ed0c' 
  AND token = 'tkmLZH8suADZWblzosGC5h3Mec4kRb4Dq1c/c0+VT/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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