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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a23f272a7fd516efdb605ad8bb7858768e0d220bd470c2f87cec7147b6759a2' 
  AND token = '+CDfS/Ry7wPkrfQsuo26/La11kqjzVhL3gSBatISTAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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