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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c1d98ae320aa1d40f3eaa2de43304e208525368093c06228d40cc46138dcf46' 
  AND token = 'zRKDSrPnYWRNORTbEOBRku6+wwTpn7NFBxrnSRN6yEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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