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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceb345a547ad5cd4015b7d2d90c59f059845f46d6dcd5888211b95be24a813e4' 
  AND token = 'ew3T98aODbMaS2cfaYU/Fep8uTkKr+EOY9zKHKE84qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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