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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be6bfffb36f8f200c723e3c82e4d305439d2fad14b7c59bf4f08924c0705e8a8' 
  AND token = 'BH+lT83iVcRn1d7NcnbCvG6LhngLMHrHhB0fkciO4U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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