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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1466b64c353952a9589d945be34ff1c595fbe42086e5eddc4c7ee5f166a5b8b9' 
  AND token = 'Azt70Stz3ufVWrNBtFY1hdoXw3Mfca8zV36FrDi/Ln4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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