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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7818f121d2a13830757e38c72a306aad58ea5ef9defe7114bd9216e49b914a0' 
  AND token = 'A55H7bj7gNRnvslb7Tiw8oXBBPEv/0/6mfgRUA+0TYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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