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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25462923b1079dd51e90b1888c9ae24764fabfe7025006594f8f7a54f7d6eee2' 
  AND token = 'G1jbNgAVhW0Wml6DBYl38cKoDFxb/0peej4He81VyUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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