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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddd20c30a0912f6ca5d21fe72b15c1f50e58ccf2f777dff83484dd522abdc3cb' 
  AND token = 'MOX0Qtw9OEhak8SrSqXxQd5116Y5yRN/aHeMfz/tOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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