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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9cde23c4573894733294237bd8b82e8be816a6c584da97668302f6d9cca9041' 
  AND token = 'tfiBP2LROt/4S6MigegDcl7JiUwX6k5A/ppHi7G4TTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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