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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '476d46919c92277a3a2d20a80d43f2c21a9c35acd68dd7b6f3b9b644bd386da9' 
  AND token = 'dTBJ8qPWNpva0kvZGlw4O7CnwiJ2IB3U46pBaEKmo/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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