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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ef76f7f17ca690c2ed184dac2a9250d5762ad349d9b7df9a9ced147ad4b657a' 
  AND token = 'PXeBJ/XLRvVCvRNku7VTk6uM1Qu+JRoPJnPFeZDu+uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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