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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c08156029dc0f156c978ed96bd83a465ecf5acd8656f72c4e30b909a349a6f8' 
  AND token = 'HoFrOTgsqm6OogJJ/Mml7cRJl4gNwc7Ay8mvgVFwLMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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