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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c2ca0ae350860c7c11c2b4a8fc4acc6759903bb9eee1b1ed21d0c0721939ed' 
  AND token = 'DFb9yeLoU3sPSsMOwjLF7GXczUuoOCNUJsqINRYjigU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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