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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71db9a398d8e4c355146409fa863e5f6534513c3fde0338478c90c19cd1a8a8d' 
  AND token = 'jBsuTyE2K2LKXX/9gP7QMOR3Ms5/jahqJcs/Qbo0Nuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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