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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc764c1e91a51cc6d21c3eebb76dc9da00290ecb22d2eb71609980fb7dba10e' 
  AND token = 'mTr9yxM5zv9wYFwUh/iwVQok2isUzstqRNs20v6yovk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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