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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84af30c48d5fcde663e8cf75d40a2a4e6b036ac00732c09eaf8ff61092489b4c' 
  AND token = 'mxWmsBNG/jsjr0tkxGgmDch5EGU1DxMJG2OsAWvt2kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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