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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '385804e6c11ba4bcc8d318dd0ab30e7dc3d44231bdbd160dade6d3e2aac43d4c' 
  AND token = 'NO5uerhyDqDFjUntFS2wHSqzIPSS0zNZvw/aWelBnx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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