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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3092e0334dbc0c426d60a3b0f465cf2bd09e2773ae61d1221c180384ef6032b' 
  AND token = 'lKzBSaa/lDhMeTdSIpEVosopyh3i51RsDEmB96q6uek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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