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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5bddd1752469fcebfdc464f9dd7eb384f08bab79f7e7cd6b69f7c43fbe19c18' 
  AND token = 'aKARqOcKKRjx23ordzzz3p++kCIK28JyPgoAdYdkWWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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