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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15f912939fac5e4664ba03c2ac63e2dc14746bae8a2bbba6a8d09f4d9a547259' 
  AND token = 'Y9LXte331CvBG/+lDr0G4XRQy66rl9eN97GBGwWsZTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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