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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5c7fce89569829c11004a406bc35c567de04dbf246bbf5a48aa2a6ebe4f73d7' 
  AND token = 'HzviiT3R/L4+8Qf1R+eexe9XhfJG4Y9SKIdN5PyPeMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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