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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0077401302c6b201a847a7ef92dc514059ed27abb0c2d8e8721beb3be04f3ed2' 
  AND token = 'KEE4eNwqDOvaDphXMOqXlMp/c/DWDHDd6eMumA/MQjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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