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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4693e8461df74f8460a0e447148929b15b7808546d55e3c66c5da4929b0a73b8' 
  AND token = 'wKsA6n0uD8j0X7t7y3faQiXuWM/Unbx4vA5IlCWY98U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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