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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b78be43cdf401a0df5ac1bb722b7d709125516f4b47b3b3fd75b4bb6a06f6773' 
  AND token = 'MFL/tPeFIEje9Sw61rrAfDc4zenMV8cgPee8GaWDpKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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