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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa8a98b78defb8b22a6de0c5be38b335ee46c47b196a9cd81cf82dc45747c231' 
  AND token = 'vSe34Tr8MrXOSIrsGypdLBC8W+xxF41vXMhNxqIb69s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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