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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bc4d9b081cf3fa970903c56ce774280083ca94cd8f6ead6380e9924c793a13b' 
  AND token = 'zgfmJedCFSy0YC8U7k1k1sLddkyuSRQuDk+iT9uT8Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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