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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a30eaf338e8f83f6f067421c292711b21d189e8c6d7e486d3295beaed3ba08a1' 
  AND token = 'FacN6O8U0RD5A3CYs/ERJ+5BjHgM6RzgpbrZYMmaur8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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