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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a3bafa2f08cf3d41bdc88847c51d0208605d229b59a11889290fce7577a32f5' 
  AND token = '991nDqUI+hZeexu6TEb8yb1rGJkgWW0Ni6lLgm1K2F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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