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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21568ead249c9a8f77c23977f50333f425303d01c3423b597eed487280835047' 
  AND token = 'fBSDpceKHOINYsPknWsT5Pfot2yJn8v7KaU9nr5uqqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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