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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd796af84b6a294172d2a0145423fa37d6119a956d3df1774480fa80c4f7d0c6a' 
  AND token = 'fqTG6urjktSO0LdVv933D3IvYvTVF4AFbF0ykbawlLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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