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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de01ffb7ce042c4c2cb085623ef8940b63d922c549492a3d53ffc2b11e881fae' 
  AND token = 'ljO4w7iTDWp7n48yubkaw7EPA0TekXAE+NZWJnHSpzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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