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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a963213631b07c0a355e06ab2069ba0706d1c28a9b5ad7ce3fb16175eab0000' 
  AND token = 'cMBCkZpNv+ziAT0hU5j+x2nCSARObcvDCYJHYf6CbGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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