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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57823f5d2c2068f523c222dcde9c7dd3a74c3d4b5aafc3f5159c70ecfda0e093' 
  AND token = 'qdYCpveagkaDOFtw/VWi6Grb/QUQv0GyZq332vegrlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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