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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4fed76f58dfeabeb51dae2ab7d26c3c1056065604bf33597aeeebd8f8aeac27' 
  AND token = '6vXuyzJ5GRpTUeJVM0r2UHXMC2min1uEOwpCe1AKOtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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