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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9b4673796b38b5d2ab9e01ee67793d9d2e84eab2b00b09e67a93ece2bfe0a68' 
  AND token = 'BNEiFAzA21cMJGQk1YYU5v4KW5qYbGQCXlAGM2nad8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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