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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87dec83688a4383418e2ba5318bba33b08bc07b8be4407185e4da978c0094abc' 
  AND token = '2mTztywlYX+pYIfcKFC+7PNYr2zEhwCR67KbGE1Py6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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