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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5eddb76dedf7fff70206a6193e23510bf14133661ebf9cfe854967ed010d7ea' 
  AND token = 'a5ctVzNWICkaMJB7vO6YwIPb/ZNoLELb4V6+iY47hms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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