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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ac1070b5c92fb2cd014554827f604ed682c1484b6459595998131256ef36a5b' 
  AND token = 'yioDAB27XiXHbeyCEIOQ2Z/bVsFCzao1ynZ1I512HRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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