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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6c7bcd1a00305dd97733bf3a4d738f851d2788de8dd087b6f876b42eb56b9be' 
  AND token = 'LnZaAUBidSiXEYegnETCovWdj7NyGvqzAJLjwf45kI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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