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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00e18438bb2f65c06c2c6186952a52df43329a228d43639423225eb72328b7f7' 
  AND token = 'mCenzVAPQ8Lw45vg0WULpqCq3J2XAaNJRqz37Yz663c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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