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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2123f5d2870d51a1d9fb22427fc734dc47f9ae70b43ac7ca1fffaae2b796d25' 
  AND token = 'qkoTqJQg9PsXFqESt4Ho7iy9ZrVAkzqwjiL8m7NmCOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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